Add relay metadata to zap requests

js/payments/zapSplit.js

@@ -10,6 +10,7 @@ import {
 } from "./lnurl.js";
 import { ensureWallet, sendPayment } from "./nwcClient.js";
 import { getPlatformLightningAddress } from "./platformAddress.js";
+import { RELAY_URLS } from "../nostr/toolkit.js";
 import { userLogger } from "../utils/logger.js";
 import {
   clampPercent,
@@ -271,6 +272,40 @@ function derivePointerTag(videoEvent) {
   return ["a", value];
 }
 
+function resolveRelayUrls(wallet) {
+  const normalized = [];
+  const seen = new Set();
+
+  const addCandidate = (candidate) => {
+    if (!candidate) {
+      return;
+    }
+    if (Array.isArray(candidate)) {
+      candidate.forEach(addCandidate);
+      return;
+    }
+    if (typeof candidate === "string") {
+      const trimmed = candidate.trim();
+      if (trimmed && !seen.has(trimmed)) {
+        seen.add(trimmed);
+        normalized.push(trimmed);
+      }
+    }
+  };
+
+  if (wallet && typeof wallet === "object") {
+    addCandidate(wallet.relayUrls);
+    addCandidate(wallet.relays);
+    addCandidate(wallet.relayUrl);
+  }
+
+  if (!normalized.length) {
+    addCandidate(Array.isArray(RELAY_URLS) ? RELAY_URLS : []);
+  }
+
+  return normalized;
+}
+
 function buildZapRequest({
   wallet,
   recipientPubkey,
@@ -302,6 +337,11 @@ function buildZapRequest({
     tags.push(["amount", String(Math.max(0, Math.round(amountSats)) * 1000)]);
   }
 
+  const relayUrls = resolveRelayUrls(wallet);
+  if (relayUrls.length) {
+    tags.push(["relays", ...relayUrls]);
+  }
+
   const event = {
     kind: ZAP_KIND,
     content: comment || "",

tests/zap-split.test.mjs

@@ -80,6 +80,12 @@ const platformAddressModule = await import("../js/payments/platformAddress.js");
 const { __resetPlatformAddressCache } = platformAddressModule;
 const { nostrClient } = await import("../js/nostr.js");
 
+const DEFAULT_WALLET_RELAYS = [
+  "wss://wallet.primary.example",
+  "wss://wallet.secondary.example",
+  "wss://wallet.primary.example",
+];
+
 function createDeps({
   commentAllowed = 120,
   platformAddress = "[email protected]",
@@ -87,6 +93,7 @@ function createDeps({
   maxSendable = 2_000_000,
   allowsNostr = true,
   sendPaymentImplementation,
+  walletRelays = DEFAULT_WALLET_RELAYS,
 } = {}) {
   let ensureWalletCalls = 0;
   const sendCalls = [];
@@ -137,6 +144,9 @@ function createDeps({
           return {
             clientPubkey: "c".repeat(64),
             secretKey: "1".repeat(64),
+            relayUrl: walletRelays[0] || null,
+            relayUrls: walletRelays.slice(),
+            relays: walletRelays.slice(),
           };
         },
         async sendPayment(invoice, { amountSats, zapRequest }) {
@@ -202,6 +212,21 @@ async function testSplitMath() {
   assert.equal(parsedZap.kind, 9734);
   assert(parsedZap.tags.some((tag) => tag[0] === "amount" && tag[1] === "900000"));
 
+  const relaysTag = parsedZap.tags.find((tag) => Array.isArray(tag) && tag[0] === "relays");
+  assert(relaysTag, "relays tag should be present in zap request");
+  const expectedRelays = Array.from(
+    new Set(
+      DEFAULT_WALLET_RELAYS.map((relay) =>
+        typeof relay === "string" ? relay.trim() : ""
+      ).filter((relay) => relay)
+    )
+  );
+  assert.deepEqual(
+    relaysTag.slice(1),
+    expectedRelays,
+    "relays tag should match wallet relay list"
+  );
+
   const platformReceipt = result.receipts[1];
   assert.equal(platformReceipt.recipientType, "platform");
   assert.equal(platformReceipt.status, "success");